Yuki just has that incredible idol appeal, so although her wink has technical weakness, the total package is very difficult to ignore.
Mariko has that wink of a beautiful, strong woman who knows who she is, knows what she wants, and knows how to use it....her wink says- "you ought to come up, and see me sometime...."
[my vote goes to:] Young Jurina really does have almost the perfect technical wink, and she is ambiwinkdextorous as well. Winkfourze is strong with that one.